The Sealy Posturepedic Plus Spring Ultra Firm mattress delivers pressure-relieving comfort to help maintain natural body alignment and reduce nagging Bed Aches night after night. The orthopedic-inspired Posturepedic Plus Support System features exclusive PrecisionFit Coils, arranged right where you need them. Plus, the DuraFlex Coil Edge provides a reinforced solid surface that's built to last.